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Rate A (Normal Rating) is based on the ampacity/thermal rating of conductor dependent on the following factors: ambient temperature, wind speed, permissible sag, etc. Rate B (Long Term Emergency Rating) is the permissible loading in the conductor for a period of time when a contingency occurs.
When you are trying to verify how PSS/E arrived with the percent loading of the line after performing a load flow solution, you have to take into account the pre- or post-contingency voltage.
